The high frequency transformer is the most important part of the switching power supply. Switching power supply generally adopts half bridge power conversion circuit, when the two switch transistor turns conduction to generate 100kHz high frequency pulse wave, and then through the high frequency transformer step-down output low voltage alternating current, high frequency transformer turns ratio of each winding is decided by the number of output voltage. Three high frequency transformer is the most prominent in the typical half bridge transformer circuit: main transformer, drive transformer and auxiliary transformer (standby transformer) of each transformer has the specification measure their prescribed by the state, such as the main transformer, as long as the power is more than 200W, the core diameter (height) is not less than 35mm auxiliary transformer, power is less than 300W when the core diameter reaches 16mm.
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